Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue <= 3.1.24 - Reflected Cross-Site Scripting

6.1
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2021-24923
CVSS 6.1 (Medium)
Publicly Published December 23, 2021
Last Updated January 22, 2024
Researcher ZhongFu Su

Description

The Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue WordPress plugin before 3.1.25 does not escape the sib-statistics-date parameter before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting issue

Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.

References

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Vulnerability Details for Brevo – Email, SMS, Web Push, Chat, and more.

Software Type Plugin
Software Slug mailin (view on wordpress.org)
Patched? Yes
Remediation Update to version 3.1.25, or a newer patched version
Affected Version
  • < 3.1.25
Patched Version
  • 3.1.25

Recent vulnerabilities in Brevo – Email, SMS, Web Push, Chat, and more.

# Title CVE ID CVSS Researchers Date
1 Brevo - Email, SMS, Web Push, Chat, and more. <= 3.3.0 - Unauthenticated Authorization Bypass via Type Juggling CVE-2025-14799 6.5 ISMAILSHADOW February 17, 2026
2 Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue) <= 3.1.87 - Cross-Site Request Forgery CVE-2024-8477 4.3 Joshua Chan October 9, 2024
3 Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue <= 3.1.82 - Cross-Site Request Forgery CVE-2024-43287 4.3 Rafie Muhammad August 16, 2024
4 Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue <= 3.1.77 - Reflected Cross-Site Scripting CVE-2024-35668 6.1 Rafie Muhammad June 3, 2024
5 Newsletter, SMTP, Email marketing and Subscribe forms by Brevo (formely Sendinblue) <= 3.1.77 - Reflected Cross-Site Scripting CVE-2026-15297 6.1 stealthcopter March 22, 2024
6 Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue <= 3.1.60 - Reflected Cross-Site Scripting via 'lang' CVE-2023-2472 6.1 Erwan LR May 10, 2023
7 Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue <= 3.1.39 - Cross-Site Scripting 7.2 Unknown April 8, 2022
8 Newsletter, SMTP, Email marketing and Subscribe forms by Sendinblue <= 3.1.30 - Reflected Cross-Site Scripting via lang & pid Parameters CVE-2021-24874 6.1 ZhongFu Su January 12, 2022

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